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Thermador C302 Service Manual
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Thermador C302 Service Manual

Built-in ovens
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See also: Care and Use Manual , Instruction and Installation Manual
Service Manual
for
Thermador
Built-In Ovens
Models:
C302 / C272
C301 / C271
92-02-025A © Thermador Corp. 1999

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Summary of Contents for Thermador C302

  • Page 1 Service Manual Thermador Built-In Ovens Models: C302 / C272 C301 / C271 92-02-025A © Thermador Corp. 1999...

  • Page 2: Table Of Contents

    Bake Mode Sequence of Events Chart ....56 Symbols You Will See in the Manual ....18 Bake Pre-Heat ..........57 Bake Mode ............58 Thermador® Warranty ........19 Proof Sequence of Events Chart ......59 Proof Pre-Heat ..........60 Servicing The Components....20 Proof Mode .............

  • Page 3: Introduction

    Models C271, C272, C301, C302 This manual is designed to be used only by qualified service personnel. Thermador recommends that customers do not service their own ovens, due to the complexity and the risk of high-voltage electrical shock. The information is organized to help the service easily find what is needed to repair the unit.

  • Page 4: Relay Boards

    “C” Oven Relay Boards RELAY BOARD MATRIX REPLAY FUNCTION Upper Oven Latch Motor Lower Oven Latch Motor None None Upper Oven Cooling Motor Lower Oven Cooling Motor Upper Oven Halogen TX Lower Oven Halogen TX Upper Oven Bake Element Upper Oven Broil Element Upper Oven Convection Element Upper Oven Convection Motor Lower Oven Bake Element...

  • Page 5: C Dac Relay Board

    “C” DAC RELAY BOARD (Digital Appliance Controls) There are 2 relay boards, 1 for a single oven and 1 for a double oven. You can use the double oven board for a single oven. You must use a double oven board for a double oven.

  • Page 6: Wire Harnesses

    Explanation of the Wire Harness Connector Housing Wires The wire harness is shown in the illustration above. PIN Header PIN Header The wire harness’ slide onto the pin headers of the relay board, display head, and touch control boards. The illustration above shows the pin headers on the relay board. Page 4...
  • Page 7 Wire Harnesses (Continued) The “C” oven uses 5 wire harnesses to transfer signal voltage between the DAC control (relay board), display head, and touch control boards (glued on the glass). The 5 wire harness’ connect to the corresponding pin headers on the corresponding components (relay board, display head, touch control board).

  • Page 8: Dac Relay Board

    DAC RELAY BOARD (continued) The relay board has 8 small pin headers. They are identified as P2, P3, P5, P9, P10, P11, P14, P15. These small pin headers carry signal voltage to specific components. The pin numbers are identified on the schematic. The illustration below shows that the arrow will always point to Pin#1.
  • Page 9 DAC RELAY BOARD (continued) The relay board has 5 large pin headers. They are identified as P0, P1, P7, P8, P18. These large pin headers carry current to specific components. The pin numberts are identified on the schematic. P0 large pin header has 8 pins and are identified as follows; P0-1 Receives 120VACfrom l2.
  • Page 10 DAC RELAY BOARD (continued) P7 large pin header has 4 pins and are identified as follows; P7-1 Blank P7-2 Blank P7-3 Current from L2 to K11 relay P7-4 Current to upper oven convection motor P8 large pin header has 4 pins and are identified as follows; P8-1 Current from L2 to K15 relay.

  • Page 11: Dac Relay Board Troubleshooting Chart

    Troubleshooting chart for relay board header pin failures Wire harness off at pin header; or circuits open: Lower oven sensor: Control functions normal. When sensor opens, f-61 code will appear. If sensor shorts, f-60 will appear. Cooling fan is on con- stantly.
  • Page 12 Relay board transformer: No fail code, no display at all. Board is dead. Both cooling motors and halogen lights: Will accept modes. In about 45 seconds F-34 will appear in the upper oven or F-64 will appear in the lower oven because the Coolingmotors did not come on to close the air switches and signal the board.

  • Page 13: Control Panel

    “C” OVEN CONTROL PANEL • Touch Control Glass • Touch Control Boards • Display Head Page 11...

  • Page 14: Electronic Oven Controls

    ELECTRONIC OVEN CONTROLS HANDLING THE BOARDS Touch Control Board The Touch Control Board and the Display Head Handle the Touch Control Board only by the are subject to failure if static electricity is trans- edges of the glass and the plastic frame. DO NOT ferred to the components during handling.

  • Page 15: Control Panel Assembly

    Control Panel Assembly The control panel assembly is comprised of the following parts; Control panel: There are a total of 9 control panels. 3 black, 3 white and 3 stainless. The control panels are what determines the color of the unit. Curved glass touch panel: There are 2 glass touch panels.

  • Page 16: Glass Touch Panel

    Glass touch panel The glass touch panel is comprised of a piece of curved glass with 2 control boards glued onto it. Left side touch control board: The large touch control board is glued on the left side of the curved glass. The large touch control board controls the following 12 modes;...

  • Page 17: Display Head

    Display Head The display head has a total of 8 pin headers (0nly 7 are used), they are identified as P1, P2, P4, P6, P8, P10 and P11. P1 pin header has 18 pins and connects to the large touch control board (P1).

  • Page 18: Display Head Troubleshooting Charts

    Troubleshooting chart for display head pin header failures Wire harness off at pin header or open circuits Accepts display signals from relay board: Glass control panel is completely dead. No display, circuit must be reset. Accepts communication signals from relay board: Glass control panel is completely dead.

  • Page 19: Serial Number/Data Sticker Location

    GENERAL SERIAL NUMBER/DATA STICKER LOCATION Back Plenum Cover Front Plenum Cover Serial Number/Data Sticker NOTE: The front plenum cover is mounted with 5 screws and the rear plenum cover with 6 screws. The front plenum cover is not mounted the same on the 27"...

  • Page 20: Symbols You Will See In The Manual

    TECH TIP!! This symbol alerts you to a service tip or a special procedure. THERMADOR ASSUMES NO RESPONSIBILITY FOR ANY REPAIRS MADE ON OUR PRODUCTS BY ANYONE OTHER THAN AUTHORIZED THERMADOR SERVICE TECHNICIANS. Page 18...

  • Page 21: Thermador® Warranty

    ® THERMADOR WARRANTY Thermador will pay for: Thermador will not pay for: Length of Warranty All repair labor and replacement Service by an unauthorized FULL ONE YEAR WARRANTY parts found to be defective due to agency. Damage or repairs Covers one year from date of materials and workmanship.

  • Page 22: Servicing The Components

    SERVICING THE COMPONENTS OVEN COMPONENT LOCATIONS Figure 1 Upper Oven Air Switch Air Switch Lower Oven Air Switch Bracket Page 20...

  • Page 23: Removing The Bake And Broil Elements

    REMOVING THE BAKE & BROIL ELEMENTS, CATALYST, & MEAT PROBE JACK (“C” MODEL OVENS ONLY) WARNING Turn off the electrical power circuit to the oven at the main junction box before servicing this unit. CAUTION When you work on the oven, be careful when handling the sheet metal parts.
  • Page 24 Bracket Screws Catalyst Broil Element Brackets BACK OF LINER Figure 4 Bake Broil Element Element 2 Top Front Mounting Screws Figure 3 BACK OF LINER White Wires Connectors Bake Element Access Bracket Panel Cover Bracket Screws Figure 2 Hex Nut Meat Probe Jack Figure 5...

  • Page 25: Removing The Hidden Bake Element

    REMOVING THE HIDDEN BAKE ELEMENT (“C” MODEL OVENS ONLY) WARNING Refer to Figure 7 for the following steps. Unwrap and remove the indicated wire Turn off the electrical power circuit to the tie from the support bracket. oven at the main junction box before ser- Remove the three screws from the support vicing this unit.
  • Page 26 Support Bracket Remove Screws Rear Panel Bake Element Wires Remove Remove Screws 3 Screws Wire Tie Flange Flange Figure 6 Remove 6 Screws Figure 7 Bend Flange Bend Flange Down Down Flange Hidden Screw Bake Element (1 of 2) Figure 8 Hidden Element Cover Screw...

  • Page 27: Removing The Oven Temperature Sensor

    REMOVING THE OVEN TEMPERATURE SENSOR Remove the racks from the oven. WARNING Remove the screws from the bracket and Turn off the electrical power circuit to the pull the oven temperature sensor forward oven at the main junction box before ser- until the wire connectors are through the vicing this unit.

  • Page 28: Removing The Convection Bake Element

    REMOVING THE CONVECTION BAKE ELEMENT WARNING Remove the racks from the oven. Remove the front screws from the left and Turn off the electrical power circuit to the right oven rack supports and remove the oven at the main junction box before ser- supports from the oven liner.

  • Page 29: Removing A Convection Fan Motor

    REMOVING A CONVECTION FAN MOTOR WARNING Remove the hex nut from the front of the convection blade. NOTE: The nut has left- Turn off the electrical power circuit to the rotating threads. oven at the main junction box before ser- vicing this unit.
  • Page 30 Oven Liner White Wire (#44) Brown Wire (#45) Fan Motor Bracket with Insulation Fan Motor Screws Convection Blade E-Ring Flat Washer Hex Nut (Left-Rotating Thread) Top Screw Top Screw Convection Baffle Figure 12 Bottom Screws Page 28...

  • Page 31: Removing A Halogen Lamp Holder

    REMOVING A HALOGEN LAMP HOLDER WARNING Pry the lamp holder out of the oven liner and cut the wires approximately 2" from Turn off the electrical power circuit to the the lamp holder body. CAUTION: Be oven at the main junction box before ser- careful not to chip or scratch the oven vicing this unit.
  • Page 32 Halogen Lamp Lamp Holder Lamp Cover Figure 13 Page 30...

  • Page 33: Removing The Control Panel

    REMOVING THE CONTROL PANEL (“C” MODEL OVENS ONLY) WARNING Refer to Figure 15 on the next page for the following steps: Turn off the electrical power circuit to the Open the upper oven door. oven at the main junction box before ser- Remove the bottom screw from the con- vicing this unit.
  • Page 34 Inset 2 Latch Catch Inset 1 Rotate Latch 90˚ Pivot Bracket To Remove Panel Detent Pin Detent Pin Clip Stirrer Clutch Screw Side of Burner Box Machine Screws Screws Screws w/ Lockwashers SUPPORT BRACKET Latch Catch Bottom Control Panel Screw Rotate Rotate Panel Up...

  • Page 35: Removing The Glass And Display Head

    REMOVING THE GLASS & DISPLAY HEAD (“C” MODEL OVENS ONLY) WARNING Remove the four control panel plate screws (two on each end) and lift it and Turn off the electrical power circuit to the the wiring off the control panel (see Fig- oven at the main junction box before ser- ure 16A).
  • Page 36 Front Panel (Rear View) Touch Control Board Connectors Screw Screw Control Panel Plate Screw Screw Figure 16A Control Panel Control Panel Glass Control Panel Plate Left Touch Right Touch Control Board Control Board Figure 16B Display Head Screw 1 Screw 2 Control Panel Plate Screw 3 Screw 4...

  • Page 37: Removing The Oven Light Switch, The Oven Door Latch Assembly, And The Hi-Temp Cutout

    REMOVING THE OVEN LIGHT SWITCH, THE OVEN DOOR LATCH ASSEMBLY and THE HI-TEMP CUTOUT WARNING in on the locking arms, and push the switch out of the vent (see inset 1). Turn off the electrical power circuit to the To remove the oven door latch assembly oven at the main junction box before ser- (see inset 2): vicing this unit.
  • Page 38 Inset 1 TECH NORMALLY OPEN (GOLD) CONTACTS DOOR OPEN = SWITCH OPEN TIP!! NORMALLY CLOSED DOOR OPEN = You will need the following tools to remove SWITCH CLOSED the components: 1/4" ratchet 1/4" thin-wall socket #2 Phillips Offset Screwdriver UPPER OVEN LOWER OVEN COOK STOP...

  • Page 39: Removing The Blower

    REMOVING THE BLOWER, DOUBLE LINE BREAK RELAY, LAMP TRANSFORMER and RELAY BOARD WARNING To remove the oven stalled fan relay (see the inset): Turn off the electrical power circuit to the a) Remove the screws and disconnect the oven at the main junction box before ser- wires from the terminals.
  • Page 40 White 24 Yellow 09 Yellow Yellow White 26 White 08 White 12 White 19 Black 34 Red 14 Yellow 10 Yellow - 20 Red 17 Red 91 Black Blue - 21 Red 18 Orange - 22 Black White Pink White 32 Black 30 Red 31 STALLED...

  • Page 41: Removing The Air Switches

    REMOVING THE AIR SWITCHES Open the lower oven door. The bottom WARNING trim mounting screws (see inset 1) are vis- Turn off the electrical power circuit to the ible at each side of the oven door, below oven at the main junction box before ser- the left and right hinges.

  • Page 42: Side View

    Mounting Screws Bracket AIR SWITCH Mounting Inset 3 Screws Bottom Trim Inset 2 Screw Bottom Trim Flange Inset 1 Side View Lower Oven Air Switch Upper Oven Figure 25 Air Switch Mounting Air Switch Bracket Screws Page 40...

  • Page 43: Removing A Blower

    REMOVING A BLOWER WARNING d) Remove the three screws that mount the motor to the bracket. Turn off the electrical power circuit to the e) Disconnect the four wires from the oven at the main junction box before ser- motor terminals. vicing this unit.
  • Page 44 BACK OF PLENUM Mounting Bracket Screw Screw Lt. Blue (97) Screw White (98) White Dk. Blue Upper Blower (24) (23) Upper Blower Figure 26 Blower Wire (24) To Blower Wire (23) To Upper Blower Motor Upper Blower Motor Blower Bracket Lower Blower Figure 27 Page 42...

  • Page 45: Removing The Lamp Transformer

    Removing the Lamp Transformer & the Upper or Lower Oven Double Line Break Relay WARNING To remove an oven stalled fan relay (see Figure 29): Turn off the electrical power circuit to the a) Remove the screws and disconnect the oven at the main junction box before ser- wires from the relay terminals.

  • Page 46: Removing An Oven Door

    REMOVING AN OVEN DOOR To remove the door: Refer to Figure 30 for the following steps. a) Grasp the door by the sides toward the Open the door to its fully open position. back and raise the front of the door sev- Raise the hinge latch over the hook on eral inches (there will be some resis- each of the hinges.

  • Page 47: Removing The Oven Door Gasket

    REMOVING THE OVEN DOOR GASKET CAUTION Position the new fiberglass gasket around the oven door so that the clips are near When you work on the oven, be careful the holes. when handling the sheet metal parts. There Working from one end of the gasket to the are sharp edges present and you can cut other, insert the gasket clips into the holes yourself if you are not careful.

  • Page 48: Removing The Oven Door Components

    REMOVING THE OVEN DOOR COMPONENTS (“C” MODEL OVENS) CAUTION To remove any of the oven door compo- nents, remove the oven door from the When you work on the oven, be careful oven (see page 2-29). when handling the sheet metal parts. There Refer to Figure 33 as you remove the door are sharp edges present and you can cut components.

  • Page 49: Removing The "C" Oven Module

    REMOVING THE “C” OVEN MODULE (27") Convection Kit—#35-00-686 (30") Convection Kit—#35-00-687 Turn off the electrical power to the oven. WARNING To make servicing easier, remove the oven Turn off the electrical power circuit to the door (see page 2-29). oven at the main junction box before ser- Remove the oven from the wall.

  • Page 50: Troubleshooting

    TROUBLESHOOTING TESTING THE COMPONENTS WARNING TO AVOID ELECTRICAL SHOCK • DISCONNECT THE POWER TO THE APPLIANCE BEFORE SERVICING. • FOR THOSE CHECKS REQUIRING THE USE OF ELECTRICAL POWER, EXERCISE EXTREME CARE. • DO NOT PERFORM HIGH-VOLTAGE TESTS. THE BLOWER MOTOR THE AIR SWITCH Refer to page 2-26 to access the blower motor.

  • Page 51: The Convection Fan Motor

    THE CONVECTION FAN MOTOR THE LAMP TRANSFORMER Refer to page 2-8 to access the convection fan motor. Refer to pages 2-20 & 2-28 to access the lamp trans- former. With no power applied, disconnect the motor wire connectors from their terminals. With no power applied, remove the wires from the terminals of the lamp transformer.

  • Page 52: The Oven Door Latch Assembly

    THE OVEN DOOR LATCH ASSEMBLY The oven door latch locks the oven door during the the switch. CLEAN cycle (see the illustration at the bottom of the To test the door latch motor windings: next column for the various latch positions). Refer to page 2-18 to access the oven door latch assembly.

  • Page 53: The Hidden Bake Element

    THE HIDDEN BAKE ELEMENT THE BROIL ELEMENT Refer to page 2-2 to access the broil element. (“C” MODELS ONLY) Refer to page 2-4 to access the bake element. With no power applied, remove the wires from the terminals of the broil element. With no power applied, remove the wires from the terminals of the hidden bake element.

  • Page 54: The Convection

    THE HI-TEMP CUTOUT THE CONVECTION The hi-temp cutout contacts open at or above 350˚F BAKE ELEMENT ±8˚, and are manually reset by pressing the reset Refer to page 2-7 to access the convection bake button. element. Refer to page 2-18 to access the hi-temp cutout. With no power applied, remove the wires from With no power applied, remove the wires from the terminals of the convection bake element.

  • Page 55: Fault Codes

    Fault Codes CODE FAULT DETECTION Power board incompatibility Communication error with power board Vcc lift-off (power board) Power board not calibrated Display board EEPROM error Misc. power board error Upper oven cancel key shorted high Lower oven cancel key shorted high Upper oven cancel key shorted low Lower oven cancel key shorted low Key stuck...

  • Page 56: C" Oven Current Flow Charts

    “C” OVEN Current Flow Charts Page 54...

  • Page 57: Oven Mode Time Charts

    Oven Mode Time Charts Seconds On Seconds On Seconds On Mode Bake Element Broil Element Convection Element Bake Preheat Bake Mode Proof Preheat Proof Mode Roast Preheat Roast Mode Broil Preheat Broil Mode Convection Preheat Convection Mode Dehydrate Preheat Dehydrate Mode Convection Bake Preheat Convection Bake Mode Convection Roast Preheat...

  • Page 58: Bake Mode Sequence Of Events Chart

    Page 56...

  • Page 59: Bake Pre-Heat

    Bake Pre-Heat Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts, the completed “air switch” circuit signals the board (signal voltage), note: if the air switch circuit is not completed within 40 seconds, the board will interpret an cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 60: Bake Mode

    Bake Mode Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 61: Proof Sequence Of Events Chart

    Page 59...

  • Page 62: Proof Pre-Heat

    Proof Pre-Heat Proof Mode Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts the completed “air switch” circuit signals the board (signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret an cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 63: Roast Sequence Of Events Chart

    Page 61...

  • Page 64: Roast Pre-Heat Mode

    Roast Pre-Heat Mode Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board (signal voltage), note: if the air switch circuit is not completed within 40 seconds, the board will interpret an cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 65: Roast Mode

    Roast Mode Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts, the completed “air switch” circuit signals the board (signal voltage). Note: if the air switch circuit is not completed, within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code.

  • Page 66: Broil Sequence Of Events Chart

    Page 64...

  • Page 67: Broil Pre-Heat

    Broil Pre-Heat Broil Mode Sequence Of Events: K4, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts, the completed “air switch” circuit signals the board (signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret an cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 68: Convection Sequence Of Events Chart

    Page 66...

  • Page 69: Convection Pre-Heat Mode

    Convection Pre-Heat Mode Convection Mode Sequence of events: K4, K10, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret an cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 70: Dehydrate Sequence Of Events Chart

    Page 68...

  • Page 71: Dehydrate Pre-Heat

    Dehydrate Pre-Heat Dehydrate Mode Sequence Of Events: K4, K10, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts, the completed “air switch” circuit signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 72: Convection Bake Sequence Of Events Chart

    Page 70...

  • Page 73: Convection Bake Pre-Heat Mode

    Convection Bake Pre-Heat Mode Sequence Of Events: K4, K8, K9, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board (signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 74: Convection Bake Mode

    Convection Bake Mode Sequence Of Events: K8, K9, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note: If the air switch circuit /s not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.
  • Page 75 Page 73...

  • Page 76: Convection Roast Sequence Of Events Chart

    Convection Roast Pre-Heat Mode Sequence Of Events: K4, K9, K1O, K11 relays close. K4 relay energizes both cooling motors; air flow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an f34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 77: Convection Roast Mode

    Convection Roast Mode Sequence Of Events; K4, K8, K10, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 ERROR CODE FOR THE UPPER OVEN, AND AN F64 error code for the lower oven.

  • Page 78: Convection Broil Sequence Of Events Chart

    Page 76...

  • Page 79: Convection Broil Pre-Heat Mode

    Convection Broil Pre-Heat Mode Convection Broil Mode Sequence Of Events: K4, K9, K11 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 80: Clean Mode Sequence Of Events Chart

    Page 78...

  • Page 81: Clean Pre-Heat Mode

    Clean Pre-Heat Mode Sequence Of Events: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit Signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret a cooling fan fault and display an F34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 82: Clean Mode

    Clean Mode Sequence Of Event: K4, K8, K9 relays close. K4 relay energizes both cooling motors; airflow from cooling motor closes the “air switch” contacts. The completed “air switch” circuit Signals the board {signal voltage). Note: if the air switch circuit is not completed within 40 seconds, the board will interpret an Cooling fan fault and display an f34 error code for the upper oven, and an F64 error code for the lower oven.

  • Page 83: C" Oven Halogen Light Circuit

    Halogen Light Circuit The halogen light transformer is a “center tap” step down transformer with a primary and a center tap secondary winding. The primary winding receives 120 volts AC and steps down the secondary winding to 12 volts Terminals #6, #8 and #10 have a 12-volt AC potential. See illustration below.

This manual is also suitable for:

C301C272C271

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